<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>ref</title>
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.16/dist/vue.js"></script>
</head>
<body>
<div id="app">
<counter ref="one" @change="handleSum"></counter>
<counter ref="two" @change="handleSum"></counter>
<div>{{sum}}</div>
</div>
<script>
Vue.component("counter",{
data:function(){
return {
number:0
}
},
template:"<div @click='handleNumPlus'>{{number}}</div>",
methods:{
handleNumPlus:function(){
this.number++;
this.$emit('change')
}
}
})
var vm=new Vue({
el:'#app',
data:{
sum:0
},
methods:{
handleSum:function(){
console.log(this.$refs.one.number)
console.log(this.$refs.two.number)
this.sum=this.$refs.one.number+this.$refs.two.number
}
}
})
</script>
</body>
</html>
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